Still, the sheer volume of pollutants, including benzene, means they pose a real risk – of worse symptoms and even death – to asthmatics and those with chronic obstructive pulmonary disease.

但是，大量的污染物质（包括苯）注定会对哮喘患者以及那些患有慢性阻塞性肺病患者构成真正的风险——使症状恶化，甚至导致死亡。

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Soil quality changes in a larger environment, soil type and environmental pollutants increase in the volume of the geographical scale and gradually expand further hardly.

土壤环境质量变化较大，土壤环境污染物种类和数量不断增加，发生的地域和规模在逐渐扩大，危害也进一步深入。

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The results show that pollutants removal performance of the system constructed by the mixed packing medium with equal volume proportion of bricks and ceram waste is the best of the four systems.

结果表明，以等体积掺混废砖块和废陶获得的混合填料构建的人工湿地系统，在处理含高浓度和低浓度有机污染物的河水时均表现出良好的除污效果。

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